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The Big Bang Theory

S2-E20 The Hofstadter Isotope

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Summary

Penny catches the eye of comic-book shopkeeper Stuart, and Leonard is devastated when she gives serious consideration to dating her new admirer. Desperate for help, Leonard enlists Sheldon to discredit his love rival by preying on his obsession with Batman. Johnny Galecki, Kaley Cuoco and Kevin Sussman star.